JP2002144301A - Woody decorative molding and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a woody decorative molding having excellent heat resistance, humidity resistance and light resistance at low cost and a method for manufacturing the molding. SOLUTION: The woody decorative molding comprises a sliced veneer 3 impregnated with a nonvolatile bulking agent, and a base 5 constituted of a synthetic resin and connected to a rear surface side of the veneer 3. The method for manufacturing the woody decorative molding comprises the steps of preparing the sliced veneer 3 impregnated wit the nonvolatile bulking agent, setting the veneer 3 in a mold, disposing the resin at the rear surface side of the veneer 3 in the mold, pressure molding the resin in the mold to integrate the veneer 3 with the resin as the base 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood-based decorative composite used for automobile interior parts, furniture, home electric appliances, and the like, in which a wood board is disposed on a front side and a synthetic resin base material is disposed on a rear side. The present invention relates to a molded article and a method for producing the same.

[0002]

2. Description of the Related Art As a conventional wooden decorative molded product of this kind,
For example, the one shown in FIG. 3 is known. The wooden decorative molded article 51 includes a front plate 53, a reinforcing member 54 bonded to the back surface thereof, and a base material 55 integrated on the back surface thereof. Coating layer 52
Are formed.

The wood board 53 is a thin slice of wood such as maple, and functions as a decorative layer of the wooden decorative molded product 51. The reinforcing member 54 is made of a fragile plate 53.
And is made of, for example, a nonwoven fabric. The base material 55 is for ensuring the strength and rigidity of the wooden decorative molded article 1, and is made of a synthetic resin. The top coat layer 52 is made of a transparent polyester paint or the like, and polishes and protects the surface of the wooden decorative molded product 51.

The wood-based decorative molded article 51 having the above-mentioned structure is formed by, for example, forming a wood board sheet by bonding a reinforcing material 54 to a wood board 53 and injecting the wood board sheet together with the synthetic resin constituting the base material 55 by injection molding. Then, a top coat is applied to the surface of the wood plate 53, and the top coat film layer 5 is formed.
2 is formed.

[0005]

However, as described above, the conventional wooden decorative molded product 51 is a composite product of materials having different physical properties, as described above. Such defects are likely to occur. That is, the synthetic resin constituting the base material 55 has a high coefficient of thermal expansion,
While the coefficient of humidity expansion is low, the wood plate 53 has a low coefficient of thermal expansion and a high coefficient of humidity expansion. For this reason, when the wooden decorative molded article 51 is placed under a high temperature, for example, in a car in summer, the base material 55 tends to thermally expand, while the wood plate 53 tends to shrink by drying. But both 5
Since the members 3 and 55 are in an integral relationship with each other, the dimensional change is restricted. As a result, a compressive stress is generated in the base material 55, and a tensile stress is generated in the plate 53. In addition, the wooden decorative molded article 51
However, when the substrate is placed under high humidity, a tensile stress is generated on the base material 55 and a compressive stress is generated on the wood plate 53.

When such internal stress is generated, the decorative wooden article 51 appears as a defect in appearance such as warping or twisting. Also, due to the internal stress, a large shearing force is generated at the joining surface between the wood plate 53 and the base material 55, and this shearing force causes a relative displacement between the two plates 53 and 55, and furthermore, a crack in the top coat film layer 52. Cause Further, when the shearing force exceeds the bonding force between the plate 53 and the base material 55, the gap between the two plates 53 and 55 is broken, so that the plate 53 is peeled or floated from the base material 55.

[0007] In order to solve such a problem, for example, a high level of heat and moisture resistance is given to an adhesive for bonding the reinforcing material 54 to the plate 53, and the adhesive plate 53 is dried and moistened. Conventionally, the top coat film layer 52 is made very thick in order to suppress expansion and contraction. However, all of these measures increase the manufacturing cost because both the material cost and the processing cost are high.

The present invention has been made in order to solve such problems, and an object of the present invention is to provide a low-cost wooden decorative molded article excellent in heat resistance, moisture resistance and light resistance, and a method for producing the same. And

[0009]

In order to achieve this object, a wooden decorative molded product according to claim 1 of the present invention comprises a wood board impregnated with a non-volatile bulking agent and a synthetic resin. And a substrate joined to the side.

[0010] According to the wooden decorative molded product, the wood board has:
Since a non-volatile bulking agent such as polyethylene glycol or phenol resin is impregnated, the wood plate is kept in a swollen state by filling the cell wall with the bulking agent (bulking effect). For this reason, even if a compressive stress or a tensile stress due to a difference in the expansion coefficient from the base material is generated in the plate due to a change in temperature or humidity, such an internal stress of the plate is caused by the bulking effect. absorption·
Be relaxed. As a result, it is possible to suppress the warp and twist of the wooden decorative molded product. In addition, by absorbing and relaxing the internal stress of the plate, the shear force generated at the joint surface with the base material is reduced, so that the relative displacement and breakage between the plate and the base material can be suppressed or prevented. In addition, it is possible to prevent problems such as peeling and floating of the wood plate from the base material caused by such a problem. In addition, since the nonvolatile bulking agent has a high boiling point and does not volatilize, the above-described bulking effect is maintained for a long time. Further, the present invention can be realized at low cost only by impregnating the veneer with a nonvolatile bulking agent.

In this case, it is preferable that the non-volatile bulking agent is composed of one of polyethylene glycol and a modified product thereof.

[0012] Polyethylene glycol and its modified form have high moisture retention properties and do not easily dry. Therefore, according to this configuration, in addition to the above-described operation, cracking of the wood plate particularly under low humidity conditions can be suppressed. In addition, polyethylene glycol and its modified form generate peroxide by light energy,
Since it functions to bleach the wood plate, it is possible to suppress discoloration of the wood plate, such as yellowing or darkening, and thereby increase the light resistance of the wooden decorative molded product.

[0013] In these cases, it is preferable that the wood plate is dyed.

According to this structure, the color of the wood plate can be easily adjusted to a desired color tone by coloring the wood plate by the dyeing process.

In this case, the dyeing treatment is preferably a vat dyeing treatment.

The vat dye originally has insolubility in water, and after being reduced into a water-soluble state, is impregnated into the wood of the wood board, and then oxidized to return to insolubility and develop color. And has high robustness.
Therefore, according to this configuration, it is possible to obtain a wooden decorative molded product having excellent color fastness with little color fading or fading. Further, since vat dyes have a wide variety of colors, the color tone of the veneer plate can be adjusted more easily. In addition, vat dyes are generally not suitable for dyeing thick wood because the reaction at the time of dyeing is fast and the permeability is not good, but in the case of wood veneer, it is very thin. The above advantages of vat dyes can be effectively obtained without such a problem.

According to another aspect of the present invention, there is provided a wooden decorative molded product comprising a veneer dyed with a vat dye and a synthetic resin. And a joined base material.

According to the wooden decorative molded product, the wood board has:
Since the vat dyeing treatment has been performed, the advantages of the vat dyes described above can be obtained. In other words, due to the high fastness of vat dyes, a wood-based decorative molded article with excellent fastness with less color fading and fading can be obtained,
The color tone of the wood veneer can be easily adjusted by the variety of vat dye colors.

In these cases, it is preferable that the wood plate has been subjected to a bleaching treatment.

According to this structure, the color of the wood plate is reduced by the bleaching process, so that a wood plate with less color unevenness can be obtained. In addition, when the dyeing process is performed at the same time, a wood plate with less color unevenness and a desired color tone can be easily obtained.

Further, in these cases, it is preferable to further include a reinforcing material interposed between the wood plate and the base material.

According to this configuration, the influence of the inherent anisotropy inherent in the wood plate can be eliminated or reduced by reinforcing the wood plate with a reinforcing material such as a non-woven fabric. Can be. In particular, in the case where the non-volatile bulking agent is impregnated into the wood plate, the warp and twist of the wood plate can be further suppressed in combination with the above-described suppressing action such as warpage.

Further, in these cases, it is preferable that a top coat film layer is formed on the surface of the wood plate.

In this configuration, the smoothness of the surface of the wooden decorative molded article is increased by the top coat film layer formed on the surface of the wood board, so that a more beautiful finish is obtained and the surface is protected. Thus, the durability can be further improved. In addition, when a vulcanizing plate is impregnated with a non-volatile bulking agent, the bulking effect absorbs / relaxes the internal stress of the veneer plate and suppresses the relative displacement between the veneer plate and the base material. Therefore, it is possible to prevent the top coat film layer from being cracked due to this.

In order to achieve the above object, the present invention provides a method for producing a wooden decorative molded product according to claim 9, wherein a wood board impregnated with a non-volatile bulking agent is prepared, and the wood board is set in a mold. Then, the synthetic resin is disposed on the back surface side of the wood plate in the mold and pressure-formed to integrate the synthetic resin with the wood plate as a base material.

According to this manufacturing method, the wooden decorative molded article according to the first aspect can be easily manufactured while simultaneously performing the molding and the integration of the base material into the wood board. The effect obtained can be obtained. In addition, the bulking effect of the non-volatile bulking agent absorbs and alleviates the internal stress of the veneer plate due to the molding pressure, so that the veneer plate is less likely to crack during molding, thereby improving the yield.

In this case, after the wood veneer is dyed,
It is preferable to carry out impregnation with a nonvolatile bulking agent.

According to this configuration, the dyeing process for adjusting the color tone of the wood plate and the impregnation process with the non-volatile bulking agent can be efficiently performed by a series of steps.

In this case, the dyeing treatment is preferably a dyeing treatment with a vat dye.

In this configuration, by applying the vat dyeing treatment to the vat dye, the above-mentioned advantage of the vat dye can be obtained, that is, a wood-based decorative molded article with less color fading and fading and excellent in fastness can be obtained. In addition, the color tone of the wood plate can be easily adjusted.

Further, in order to achieve the above object, a method for producing a wooden decorative molded product according to the twelfth aspect of the present invention comprises preparing a wood veneer, subjecting the wood veneer to a dyeing treatment with a vat dye, Is set in a metal mold, and a synthetic resin is arranged on the back side of the metal plate in the metal mold and pressure-formed to integrate the synthetic resin with the metal plate as a base material.

According to this manufacturing method, the wooden decorative molded article according to the fifth aspect can be easily manufactured while simultaneously performing the molding and the integration of the base material into the wood board, and the above-described fifth aspect provides The effect obtained can be obtained.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show a method for producing a wooden decorative molded article according to an embodiment of the present invention, and a manufactured wooden decorative molded article. As shown in FIG. 2 (d), this wooden decorative molded product 1
Has basically the same configuration as the above-mentioned conventional wood-based decorative molded product 51, that is, the wood veneer plate 3 on the front side, the reinforcing material 4 bonded to the back surface thereof, and the integrally formed back surface. And a topcoat coating layer 2 is formed on the surface of the board 3.

The wood board 3 is used to decorate the wooden decorative molded article 1, and is formed by slicing solid wood such as maple or walnut into a thin piece having a thickness of about 0.2 mm. Also, as described later, the plate 3 includes
A bleaching process and a dyeing process are performed, and a nonvolatile bulking agent is impregnated. In this embodiment, polyethylene glycol (hereinafter, referred to as “PEG”) is used as the non-volatile bulking agent.

The reinforcing member 4 is made of, for example, a non-woven fabric or Japanese paper. The reinforcing member 4 reinforces the wood plate 3, eliminates or reduces the influence of the anisotropy, and joins and integrates the base material 5 by injection molding. It functions as an anchoring layer at the time. In the present embodiment, the reinforcing member 4 is formed of a thin nonwoven fabric having a thickness of about 0.1 mm made of polyester, vinylon, or the like.

The substrate 5 imparts strength and rigidity to the wooden decorative molded article 1, and is formed to be considerably thicker than other components. In the present embodiment, the base material 5 is integrally formed by injection molding. Therefore, the base material 5 is made of a synthetic resin suitable for injection molding and having excellent strength, heat resistance, dimensional stability, and the like, such as ABS and polycarbonate. It is configured.

The top coat film layer 2 is made of a transparent polyester paint or the like, and is provided with a polished finish to protect the surface of the wooden decorative molded article 1 and to give a sense of quality.

Next, a method for producing the wooden decorative molded article 1 will be described. First, a plate 3 and a reinforcing member 4 made of the above-mentioned materials are prepared, and as shown in FIG.
Are sequentially subjected to a bleaching treatment, a dyeing treatment, and a PEG impregnation treatment. The bleaching process shown in FIG.
To reduce the color unevenness of the color
For example, this is performed using a hydrogen peroxide solution. The dyeing process shown in FIG. 2B is performed by coloring the wood 3
This is for adjusting the veneer plate 3 to a desired color tone. In the present embodiment, for example, the veneer dye is used as follows.

This vat dye originally has insolubility in water, and after being reduced into water soaked into the wood of the wood board, it is oxidized to return to insoluble and develop color. It is to let. Variations in the colors of vat dyes are abundant, and in this embodiment, for example,
Green 1, V. Green 3, V. Red 10, V.I. Red 15, V.I. Black 8, V. Black 27, V.I.
Yellow 2 or the like is used.

The dyeing treatment with a vat dye comprises a coloring step and a coloring step. First, in the coloring step, a predetermined amount of water is put into a water tank, and the vat dye and a reducing agent and an alkali agent as dyeing assistants are respectively added in predetermined amounts. Examples of the reducing agent include hydrosulfite and sulfurous acid, and examples of the alkaline agent include inorganic alkalis such as sodium hydroxide,
Organic alkalis such as triethanolamine are exemplified.

Since vat dyes are inherently insoluble, they are not dissolved in water but dispersed in water when they are simply put in water, and hydrogen (H) is added by the added reducing agent. Is reduced by In addition, the vat dye becomes water-soluble by replacing the hydrogen with a sodium salt or the like by an alkali agent to form a leuco salt (-ONa). As described above, a dye solution (dye bath) is prepared in the water tank. Then, after immersing the wood board 3 in the prepared dye bath,
The dye bath is heated to a predetermined temperature, and this predetermined temperature is maintained for a predetermined time. As a result, the dye solution penetrates into the plate 3 to perform coloring, thereby completing the coloring step. Note that this coloring step is preferably performed in a closed water tank in order to prevent the dye solution from being returned to the insoluble state by being oxidized by oxygen in the air.

In the coloring step following the above-described coloring step, first, the wood board 3 is taken out of the dye bath and transferred to a water tank (separate bath) containing a neutralizing agent (bath stabilizer) and an oxidizing agent. Examples of the neutralizing agent include acetic acid, phosphoric acid, and hydrochloric acid, and examples of the oxidizing agent include hydrogen peroxide, silver oxide, oxo salts, and halogens. Next, the separate bath is heated to a predetermined temperature, and the predetermined temperature is maintained for a predetermined time. Thereby, the vat dye in the state of the leuco salt described above is neutralized by the neutralizing agent, and further oxidized by the oxidizing agent, thereby forming a color. Next, the colored plate is taken out of another bath and naturally or forcibly dried to complete the dyeing process.

By the above-described bleaching treatment and dyeing treatment, a wood plate 3 having a desired color tone with less color unevenness can be easily obtained. In addition, in the present embodiment, in particular, since the vat dye is subjected to the dyeing treatment as the dyeing treatment, the veneer dye has a high robustness, so that the veneer 3 has less discoloration and fading of the veneer board 3 and a vat dye. The color tone of the wood plate 3 can be adjusted more easily by the wide variety of colors. Depending on the relationship between the original color tone and color unevenness of the wood plate 3 and the finally desired color tone and its uniformity, it is also possible to perform only one of the bleaching process and the dyeing process. is there.

Next, as shown in FIG. 4C, the plate 3 is impregnated with PEG. This impregnation is performed, for example, by immersing the wood plate 3 in a PEG solution having a predetermined molecular weight for a predetermined time. Thereby, the PEG is filled in the cell wall of the board 3, so that the board 3 is kept in a swollen state. As described above, in the present embodiment, the bleaching process, the dyeing process, and the PEG impregnation process of the wood plate 3 are performed as follows.
It is performed efficiently by a series of steps.

Next, the wood plate 3 (FIG.
By bonding the reinforcing material 4 to the back surface of (a)), the wood board sheet 6 is produced (FIG. 2 (b)). Next, the prepared veneer sheet 6 is set in a mold (not shown),
By injecting the molten synthetic resin onto the back surface of the wood sheet 6, the base material 5 is integrated with the back surface of the wood sheet 6, and the whole is formed into a predetermined shape (FIG. 3C). Finally, a top coat coating layer 2 is formed on the surface of the wood board 3 by using a coating machine C to complete the manufacture of the wooden decorative molded article 1 (FIG. 4D). ).

As described above, according to the wooden decorative molded article 1 of the present embodiment, the wood board 3 is impregnated with PEG as a non-volatile bulking agent, and is filled in the cell wall. It is kept in a swollen state (bulking effect). Therefore, even if a compressive stress or a tensile stress due to a difference in expansion coefficient from the base material 5 is generated in the wood plate 3 due to a change in temperature or humidity, the internal stress of the wood plate 3 is absorbed by the bulking effect.・ Relieved. As a result, warp and twist of the wooden decorative molded article 1 can be suppressed.
Also, at the time of injection molding, the bulking effect absorbs and alleviates the internal stress of the wood plate 3 due to the injection pressure, so that cracks in the wood plate 3 are less likely to occur, so that the yield can be improved.

Further, the absorption and relaxation of the internal stress of the plate 3 reduces the shearing force generated at the joint surface with the substrate 5, so that the relative displacement and breakage of the plate 3 and the substrate 5 can be reduced. Therefore, it is possible to prevent problems such as cracking of the topcoat coating layer 2 and peeling or floating of the buckle board 3 due to the above. In addition, since the nonvolatile bulking agent has a high boiling point and does not volatilize,
The above-described bulking effect can be maintained for a long time.

The PEG employed as the non-volatile bulking agent in the present embodiment has high moisture retention properties and does not easily dry, so that cracking of the plate 3 particularly under low humidity conditions can be suppressed. Can be. Furthermore, P
EG generates peroxide by light energy and performs an action of bleaching the veneer plate 3, so that discoloration of the veneer plate 3, such as yellowing or darkening, can be suppressed. Can be increased. Moreover, the woody decorative molded product 1 of the present embodiment only needs to impregnate the wood plate 3 with PEG, and can be realized at low cost. Note that the above effects can be obtained by using a modified form of PEG.
Can be obtained as well.

Further, in this embodiment, since the veneer dye is used for dyeing the wood board 3, the veneer dye has a high fastness, and the veneer dye has excellent fastness with less color fading and fading. A product can be obtained, and the color tone of the veneer plate 3 can be adjusted more easily due to the variety of colors of the vat dye. In addition,
Vat dyes are not generally suitable for dyeing thick wood because vat dyes react quickly during dyeing and have poor permeability.
In the case of (1), the above-mentioned advantages of the vat dye can be effectively obtained without such a problem of the vat dye.

In the present embodiment, the effect of the anisotropy inherent in the wood board 3 can be eliminated or reduced by reinforcing the wood board 3 with the reinforcing material 4 such as a non-woven fabric. Warpage and torsion of the article 1 can be further suppressed. In addition, the smoothness of the surface of the wooden decorative molded article 1 is increased by the top coat coating layer 2 formed on the surface of the wood board 3, so that a more beautiful finish is obtained and the surface is protected. Durability can be increased.

The present invention can be implemented in various modes without being limited to the above-described embodiments.
For example, in the embodiment, PEG is used as the non-volatile bulking agent impregnated in the plate 3, but instead of this, another appropriate one such as the above-mentioned modified PEG or phenol resin is employed. It is possible. Further, in the embodiment, the impregnation with PEG is performed after the dyeing treatment of the wood board 3, but is not limited thereto.
It can be performed at any time, such as in the state of a log or flitch before the formation of the wood board 3 or after injection molding and before topcoat coating. Further, in the embodiment, the veneer 3 is dyed with the vat dye.
However, the present invention is not limited to this, and it can be carried out with any other suitable dye such as a direct dye, a reactive dye or a basic dye.

Further, in the embodiment, the molding of the wooden decorative molded article 1 and the joining and integration of the wood board 3 and the base material 5 are performed by injection molding. It can also be performed by a hot press or a cold press. Further, the materials of the wood plate 3 and the reinforcing member 4 described in the embodiment are merely examples, and it is needless to say that other appropriate arbitrary materials can be appropriately used. In addition, the detailed configuration can be appropriately changed within the scope of the present invention.

[0053]

As described in detail above, according to the present invention,
It has an effect that a wooden decorative molded article having excellent heat resistance, moisture resistance and light resistance can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a view showing steps up to a middle of a method for producing a wooden decorative molded product according to an embodiment of the present invention.

FIG. 2 is a view showing remaining steps of the manufacturing method of FIG. 1;

FIG. 3 is a schematic cross-sectional view showing an example of a conventional wooden decorative molded product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wooden decorative molded article 2 Top coat film layer 3 Wood board 4 Reinforcement material 5 Base material

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B32B 21/08 B32B 21/08 33/00 33/00 (72) Inventor Yoshiaki Sano Terashima-cho, Hamamatsu-shi, Shizuoka 200 No. in Kawagoki Seisakusho Co., Ltd. (72) Inventor Tomoko Nishiyama, Gifu City, Gifu City, 1941 Honjo Kumanomae 1 Gi Sen Co., Ltd. F-term within the company (reference) 2B002 AA01 AA02 BA01 BB02 BB06 BB12 DA04 DA06 2B230 AA07 AA08 AA11 AA15 AA16 AA22 AA27 BA03 BA18 CB01 CB06 CC14 CC15 EA11 EA15 EA17 EB01 EB03 EB13 A30 BA23 A29 A29 BA29 EB28 A29 EB28 DA04 EA02 EA13 FA21 FA31 FA33 FA47 GA03 HA01 4F100 AH02A AK01B AP01A AT00C BA03 BA04 BA07 BA10A BA10B BA10D CC00D DG15C EJ82A GB33 GB48 GB81 JD04 JJ03 JK15D JL09 JL10A

Claims (12)

[Claims] 1. A wooden decorative molded article comprising: a wood board impregnated with a non-volatile bulking agent; and a base material made of a synthetic resin and bonded to the back side of the wood board. 2. The wood decorative molded article according to claim 1, wherein the non-volatile bulking agent is constituted by one of polyethylene glycol and a modified product thereof. 3. The wooden decorative molded article according to claim 1, wherein a dyeing treatment is applied to the wood board. 4. The wooden decorative molded article according to claim 3, wherein the dyeing treatment is a vat dyeing treatment. 5. A wood-based decorative molding comprising: a wood veneer dyed with a vat dye; and a base material made of a synthetic resin and bonded to the back surface of the wood veneer. Goods. 6. The wood decorative molded article according to claim 1, wherein the wood board has been subjected to a bleaching treatment. 7. The apparatus according to claim 1, further comprising a reinforcing member interposed between said wood plate and said base material.
A wood-based decorative molded article according to any one of Items 1 to 6. 8. A top coat film layer is formed on the surface of the wood board.
The woody molded article according to any one of the above. 9. A wood board impregnated with a non-volatile bulking agent is prepared, this wood board is set in a mold, and a synthetic resin is arranged on the back side of the wood board in the mold and pressure-formed. A method for producing a wooden decorative molded product, wherein the synthetic resin is integrated with the wood board using the synthetic resin as a base material. 10. The method for producing a wood decorative molded product according to claim 9, wherein the wood veneer is impregnated with the nonvolatile bulking agent after the wood veneer is dyed. 11. The method according to claim 10, wherein the dyeing treatment is a dyeing treatment with a vat dye. 12. A wood veneer is prepared, the veneer is dyed with a vat dye, the wood veneer is set in a mold, and a synthetic resin is applied to the back side of the wood veneer in the metal mold. A method for manufacturing a wooden decorative molded product, wherein the synthetic resin is integrated with the wood board using the synthetic resin as a base material by arranging and pressure-forming.